SB20260320108 - Exposure of sensitive information to an unauthorized actor in Linux kernel ipv6
Published: March 20, 2026
Security Bulletin ID
SB20260320108
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Exposure of sensitive information to an unauthorized actor (CVE-ID: CVE-2026-23247)
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper output neutralization in the TCP sequence number generation mechanism when handling SYN cookies. A remote attacker can send specially crafted TCP connection requests to disclose sensitive information.
The attacker can exploit the side-channel to infer TCP source ports, enabling off-path attacks that leak information about connection parameters.
Remediation
Install update from vendor's website.